图象问题是高考考查的热点.在全国各地的高考试题中,均有一定数量的图形考题出现,且占有较大的分值比例,有关图象试题的设计意图,明显由“注重对状态的分析”转化为“注重对过程的理解和处理.处理该类问题过程中往往要借助于物理图象的斜率,物理图象的斜率代表一物理量随另一物理量变化的快慢,即用两物理量增量的比值来表示,斜率往往代表另外一个有特定意义的物理量,如s-t图象中的斜率为速度,v- There are a number of graphic exams in the national examination questions all over the country, and occupy a larger proportion of scores, the design intent of the image test questions, obviously from the ”pay attention to the state Analysis “into ” focus on the understanding and processing of the process.In dealing with this type of problem often rely on the slope of the physical image, the slope of the physical image represents a physical variable with the speed of another physical change, that is, The ratio between the two physical quantities to increase, the slope often represents another physical value has a specific meaning, such as the st rate of the slope of the image, v-